Microstructure and nanoscratch behavior of spark-plasma-sintered Ti-V-Al-Nb-Hf high-entropy alloy

Journal of Materials Research and Technology Pub Date : 2024-07-23 DOI:10.1016/j.jmrt.2024.07.081

Sheetal Kumar Dewangan, Nagarjuna Cheenepalli, Hansung Lee, Byungmin Ahn

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Abstract

In this work, an equiatomic Ti-V-Al-Nb-Hf high-entropy alloy (HEA) was designed by thermodynamic simulation and prepared experimentally via a powder metallurgy approach. A nanoindentation and nano scratch technique was used to study the mechanical and friction behavior of the HEA. The results revealed that a nano hardness of 7.39 ± 0.4 GPa and an elastic modulus of 140.75 ± 6.3 GPa was achieved. The coefficient of friction (COF) and creep behavior of the alloy were studied by scratch tests in ramping mode under constant-loading conditions. The COF quickly increased as the normal load increased at the beginning stage of creep performance. Additionally, three-dimensional modeling was performed to obtain a graphical representation, which can be used to explore the morphology and geometry of the scratched track. From the experimental findings, the creep behavior of the alloy is classified into two separate regimes: transient and steady-state regions. The present study demonstrates the scratch and creep behavior of the HEA in the context of the scratch mechanisms.

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火花等离子烧结 Ti-V-Al-Nb-Hf 高熵合金的微观结构和纳米划痕行为

在这项工作中，通过热力学模拟设计了等原子 Ti-V-Al-Nb-Hf 高熵合金 (HEA)，并通过粉末冶金方法进行了实验制备。采用纳米压痕和纳米划痕技术研究了 HEA 的机械和摩擦行为。结果显示，纳米硬度为 7.39 ± 0.4 GPa，弹性模量为 140.75 ± 6.3 GPa。在恒定加载条件下，通过斜坡模式划痕试验研究了合金的摩擦系数（COF）和蠕变行为。在蠕变性能的初始阶段，随着法向载荷的增加，摩擦系数迅速增大。此外，还进行了三维建模，以获得图形表示，用于探索划痕轨迹的形态和几何形状。从实验结果来看，合金的蠕变行为分为两种不同的状态：瞬态区和稳态区。本研究从划痕机理的角度展示了 HEA 的划痕和蠕变行为。

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Journal of Materials Research and Technology

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